package com.zhibi.util.verify;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.util.Random;

import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;

/**
 * 得到图片验证码
 *
 */
public class ImageCode {
    // 图片的宽度。
    private int width = 160;
    // 图片的高度。
    private int height = 40;
    // 验证码字符个数
    private int codeCount = 4;
    // 验证码干扰线数
    private int lineCount = 20;
    // 验证码
    private String code = null;
    // 验证码图片Buffer
    private BufferedImage buffImg = null;
    Random random = new Random();
    //验证码类型 验证码类型 1:英数字 2:汉字 3:运算公式
	private int codeType = 1;
	// 英数字
	private String codeSequence1 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890";
	// 汉字
	private String codeSequence2 = "\u7684\u4e00\u4e86\u662f\u6211\u4e0d\u5728\u4eba\u4eec\u6709\u6765\u4ed6\u8fd9\u4e0a\u7740\u4e2a\u5730\u5230\u5927\u91cc\u8bf4\u5c31\u53bb\u5b50\u5f97\u4e5f\u548c\u90a3\u8981\u4e0b\u770b\u5929\u65f6\u8fc7\u51fa\u5c0f\u4e48\u8d77\u4f60\u90fd\u628a\u597d\u8fd8\u591a\u6ca1\u4e3a\u53c8\u53ef\u5bb6\u5b66\u53ea\u4ee5\u4e3b\u4f1a\u6837\u5e74\u60f3\u751f\u540c\u8001\u4e2d\u5341\u4ece\u81ea\u9762\u524d\u5934\u9053\u5b83\u540e\u7136\u8d70\u5f88\u50cf\u89c1\u4e24\u7528\u5979\u56fd\u52a8\u8fdb\u6210\u56de\u4ec0\u8fb9\u4f5c\u5bf9\u5f00\u800c\u5df1\u4e9b\u73b0\u5c71\u6c11\u5019\u7ecf\u53d1\u5de5\u5411\u4e8b\u547d\u7ed9\u957f\u6c34\u51e0\u4e49\u4e09\u58f0\u4e8e\u9ad8\u624b\u77e5\u7406\u773c\u5fd7\u70b9\u5fc3\u6218\u4e8c\u95ee\u4f46\u8eab\u65b9\u5b9e\u5403\u505a\u53eb\u5f53\u4f4f\u542c\u9769\u6253\u5462\u771f\u5168\u624d\u56db\u5df2\u6240\u654c\u4e4b\u6700\u5149\u4ea7\u60c5\u8def\u5206\u603b\u6761\u767d\u8bdd\u4e1c\u5e2d\u6b21\u4eb2\u5982\u88ab\u82b1\u53e3\u653e\u513f\u5e38\u6c14\u4e94\u7b2c\u4f7f\u5199\u519b\u5427\u6587\u8fd0\u518d\u679c\u600e\u5b9a\u8bb8\u5feb\u660e\u884c\u56e0\u522b\u98de\u5916\u6811\u7269\u6d3b\u90e8\u95e8\u65e0\u5f80\u8239\u671b\u65b0\u5e26\u961f\u5148\u529b\u5b8c\u5374\u7ad9\u4ee3\u5458\u673a\u66f4\u4e5d\u60a8\u6bcf\u98ce\u7ea7\u8ddf\u7b11\u554a\u5b69\u4e07\u5c11\u76f4\u610f\u591c\u6bd4\u9636\u8fde\u8f66\u91cd\u4fbf\u6597\u9a6c\u54ea\u5316\u592a\u6307\u53d8\u793e\u4f3c\u58eb\u8005\u5e72\u77f3\u6ee1\u65e5\u51b3\u767e\u539f\u62ff\u7fa4\u7a76\u5404\u516d\u672c\u601d\u89e3\u7acb\u6cb3\u6751\u516b\u96be\u65e9\u8bba\u5417\u6839\u5171\u8ba9\u76f8\u7814\u4eca\u5176\u4e66\u5750\u63a5\u5e94\u5173\u4fe1\u89c9\u6b65\u53cd\u5904\u8bb0\u5c06\u5343\u627e\u4e89\u9886\u6216\u5e08\u7ed3\u5757\u8dd1\u8c01\u8349\u8d8a\u5b57\u52a0\u811a\u7d27\u7231\u7b49\u4e60\u9635\u6015\u6708\u9752\u534a\u706b\u6cd5\u9898\u5efa\u8d76\u4f4d\u5531\u6d77\u4e03\u5973\u4efb\u4ef6\u611f\u51c6\u5f20\u56e2\u5c4b\u79bb\u8272\u8138\u7247\u79d1\u5012\u775b\u5229\u4e16\u521a\u4e14\u7531\u9001\u5207\u661f\u5bfc\u665a\u8868\u591f\u6574\u8ba4\u54cd\u96ea\u6d41\u672a\u573a\u8be5\u5e76\u5e95\u6df1\u523b\u5e73\u4f1f\u5fd9\u63d0\u786e\u8fd1\u4eae\u8f7b\u8bb2\u519c\u53e4\u9ed1\u544a\u754c\u62c9\u540d\u5440\u571f\u6e05\u9633\u7167\u529e\u53f2\u6539\u5386\u8f6c\u753b\u9020\u5634\u6b64\u6cbb\u5317\u5fc5\u670d\u96e8\u7a7f\u5185\u8bc6\u9a8c\u4f20\u4e1a\u83dc\u722c\u7761\u5174\u5f62\u91cf\u54b1\u89c2\u82e6\u4f53\u4f17\u901a\u51b2\u5408\u7834\u53cb\u5ea6\u672f\u996d\u516c\u65c1\u623f\u6781\u5357\u67aa\u8bfb\u6c99\u5c81\u7ebf\u91ce\u575a\u7a7a\u6536\u7b97\u81f3\u653f\u57ce\u52b3\u843d\u94b1\u7279\u56f4\u5f1f\u80dc\u6559\u70ed\u5c55\u5305\u6b4c\u7c7b\u6e10\u5f3a\u6570\u4e61\u547c\u6027\u97f3\u7b54\u54e5\u9645\u65e7\u795e\u5ea7\u7ae0\u5e2e\u5566\u53d7\u7cfb\u4ee4\u8df3\u975e\u4f55\u725b\u53d6\u5165\u5cb8\u6562\u6389\u5ffd\u79cd\u88c5\u9876\u6025\u6797\u505c\u606f\u53e5\u533a\u8863\u822c\u62a5\u53f6\u538b\u6162\u53d4\u80cc\u7ec6";
	// 运算公式数字
	private String[] codeSequence3 = { "1:壹", "2:贰", "3:叁", "4:肆", "5:伍", "6:陆", "7:柒", "8:捌", "9:玖" };
	// 运算公式操作符
	private String[] codeOperate = { "+:加", "-:减", "*乘:"};
	
    
	/**
	 * 验证码构造函数，参数按默认值
	 */
    public ImageCode() {
        creatImage();
    }
    
    /**
     * 验证码构造函数
     * @param width  图片看度
     * @param height 图片高度
     */
    public ImageCode(int width, int height) {
        this.width = width;
        this.height = height;
        creatImage();
    }

    /**
     * 验证码构造函数
     * @param width  图片宽度
     * @param height 图片高度
     * @param codeCount 字符个数
     */
    public ImageCode(int width, int height, int codeCount) {
        this.width = width;
        this.height = height;
        this.codeCount = codeCount;
        creatImage();
    }    
    
    /**
     * 验证码构造函数
     * @param width  图片宽度
     * @param height 图片高度
     * @param codeCount 字符个数
     * @param lineCount 干扰线条数
     */
    public ImageCode(int width, int height, int codeCount, int lineCount) {
        this.width = width;
        this.height = height;
        this.codeCount = codeCount;
        this.lineCount = lineCount;
        creatImage();
    }
    
    /**
     * 验证码构造函数
     * @param width  图片宽度
     * @param height 图片高度
     * @param codeCount 字符个数
     * @param lineCount 干扰线条数
     * @param codeType 验证码类型 1:英数字 2:汉字 3:运算公式
     */
    public ImageCode(int width, int height, int codeCount, int lineCount, int codeType) {
        this.width = width;
        this.height = height;
        this.codeCount = codeCount;
        this.lineCount = lineCount;
        this.codeType = codeType;
        creatImage();
    }

    /**
     * 生成验证图片
     */
    private void creatImage() {
        int fontWidth = width / codeCount;// 字体的宽度
        int fontHeight = height - 10;// 字体的高度
        int codeY = height - 8;

        // 图像buffer
        buffImg = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
        Graphics2D g = buffImg.createGraphics();
        // 设置背景色
//        g.setColor(getRandColor(200, 250));
        g.setColor(Color.WHITE);
        g.fillRect(0, 0, width, height);
        
        // 设置字体
        Font font = new Font("Fixedsys", Font.BOLD, fontHeight);
        g.setFont(font);

        // 设置干扰线
        for (int i = 0; i < lineCount; i++) {
            int xs = random.nextInt(width);
            int ys = random.nextInt(height);
            int xe = xs + random.nextInt(width);
            int ye = ys + random.nextInt(height);
            g.setColor(getRandColor(1, 255));
            g.drawLine(xs, ys, xe, ye);
        }

        // 添加噪点
        float yawpRate = 0.01f;// 噪声率
        int area = (int) (yawpRate * width * height);
        for (int i = 0; i < area; i++) {
            int x = random.nextInt(width);
            int y = random.nextInt(height);

            buffImg.setRGB(x, y, random.nextInt(255));
        }
        
        /*
         * 得到字符串
         */
        String str1 = "";
        if (codeType == 1) {
        	str1 = randomStr1(codeCount);// 得到随机字符
            this.code = str1;
        } else if (codeType == 2) {
        	str1 = randomStr2(codeCount);// 得到随机字符
            this.code = str1;
        } else if (codeType == 3) {
        	str1 = randomStr3();// 得到随机字符
        }
        
        fontWidth = width / str1.length();// 字体的宽度
        
        for (int i = 0; i < str1.length(); i++) {
            String strRand = str1.substring(i, i + 1);
            g.setColor(getRandColor(1, 255));
            g.drawString(strRand, i*fontWidth+3, codeY - random.nextInt(5));
        }
    }

    /**
     * 得到英文字母和数字
     * @param n
     * @return
     */
    private String randomStr1(int n) {
        String str1 = codeSequence1;
        String str2 = "";
        int len = str1.length() - 1;
        double r;
        for (int i = 0; i < n; i++) {
            r = (Math.random()) * len;
            str2 = str2 + str1.charAt((int) r);
        }
        return str2;
    }
    
    /**
     * 得到汉字
     * @param n
     * @return
     */
    private String randomStr2(int n) {
        String str1 = codeSequence2;
        String str2 = "";
        int len = str1.length() - 1;
        double r;
        for (int i = 0; i < n; i++) {
            r = (Math.random()) * len;
            str2 = str2 + str1.charAt((int) r);
        }
        return str2;
    }
    
    /**
     * 得到运算符
     * @return
     */
    private String randomStr3()  {
    	try {
			String[] op1 = (codeSequence3[random.nextInt(codeSequence3.length - 1)]).split(":");
			String[] op = (codeOperate[random.nextInt(codeOperate.length - 1)]).split(":");
			String[] op2 = (codeSequence3[random.nextInt(codeSequence3.length - 1)]).split(":");
			
			ScriptEngineManager manager = new ScriptEngineManager();
			ScriptEngine se = manager.getEngineByName("js");
			String str = op1[0] + op[0] + op2[0];
			Double result = (Double) se.eval(str);
			this.code = "" + Math.round(result);	
			
			return op1[1] + op[1] + op2[1] + "等于";
		} catch (Exception e) {
			// TODO: handle exception
			return "";
		}
    }

    /**
     * 得到随机颜色
     * @param fc
     * @param bc
     * @return
     */
    private Color getRandColor(int fc, int bc) {// 给定范围获得随机颜色
        if (fc > 255)
            fc = 255;
        if (bc > 255)
            bc = 255;
        int r = fc + random.nextInt(bc - fc);
        int g = fc + random.nextInt(bc - fc);
        int b = fc + random.nextInt(bc - fc);
        return new Color(r, g, b);
    }
    

    public BufferedImage getBuffImg() {
        return buffImg;
    }

    public String getCode() {
        return code.toLowerCase();
    }
    

}
